Drawing-pen.



No 768,153. PATENTED AUG. 23, 1904.

I G. SGHOENNER.

DRAWING PEN.

APPLICATION FILED FEM, 1904.

N0 MODEL.

@ IM I e a I g d v a f1 g z" 5 O a i a f 4 M W M vv/ 7"NE6 6 56 //vVISA/TOP? Geaz A cAYoenQnefi Patented August 23, 1904.

PATENT OFFI E.

GEORG SCHOENNER, OF NUREMBERG, GERMANY.

DRAWING-PEN.

SPECIFICATION forming part of Letters lPatent No. 768,153, dated August23, 1904.

Application filed February 4, 1904. Se a NOA 192,003. (No model-' To allwhom it may concern.-

Be it known that I, Gnone SoHoENNnR,

' manufacturer, a subject of the German Emperor, residing at Nuremberg,in theEmpire of Germany, (whose full postal address is 7 Gartenstrasse,Nuremberg, aforesaid,) have invented certain new and useful Improvementsin Drawing-Pens, of which the follow ing is a specification.

This invention relates to an improvement in the kind of ruling-pens inwhich the blades whilein use may be allowed to spring apart and becleaned Without adjusting the screw regulating the thickness of thelines.

This invention has for its object to simplify as far as possible thehandling of such rulingpens and to provide a locking and releasingmechanism for the spring-blades, which when the drawing-pen is in use isnot cumbersome or in the way of the draftsrnan.

Two forms of construction of the arrangement are shown in theaccompanying drawings, Figure I being an elevation; Fig. II, a sideview, partially in section; Fig. 'III, an elevation of another form ofconstruction; and Fig. IV, aside View, partially in section, showing theblades sprung apart.

One spring-blade, 60, carries a set-screw b, which is provided inthe-usual manner at its lower end with a thickened head 0 and a thinnerneck joining on above the head. On the inner side of the lowerspring-blade e a small disk d is revolubly mounted, which when thedrawing-pen is in a position for use engages the thickened head of theset-screw. For this object a concentric slot it is provided in the diskf at a distance determined by the distance of the set-screw from thepivot g, on which the 'diskturns, which slot 7L fits over the neck dbehind the thickened head a, and therethickened head 0 fits when ally bydraws the upper spring-blade a against or toward the lower one. In orderto allow of the thickened head 0 passing through the disk f, the end ofthe slot has an enlargement 2',

corresponding in. size to the diameter of the head 0. As shown, however,in Figs. III and IV, the arrangement may be such that the Iapproximately to about half the thickness of the disk. V

I declare that what I claim is A I mounted on a blade 6 which disk when.turned forward-in one direction fits by means of a slot it over thethickened head 0 of the set-screw I) mounted in the other blade 0, the

disk f thereby holding the blades in the position for use, but whichdisk on being turned back again releases the set-screw and therebyallows the blades to spring apart to a sufficient extent for their moreconvenient cleaning, substantially as described.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

GEORG SCHOENNER.

Witnesses: I

'LEONHARD KonRBER, REINHOLD REUs.

c rawing-pen comprising a disk f pivot--

